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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ok, I just tested and it works fine using the commands shown in the readme in the ZIP file. Everything you need for that (bar esptool.py) is in the ZIP.
I don't understand what the problem you're having is? If you want to use the 1.5 bootloader that's up to you, but there's doesn't seem to be anything wrong with using version 1.4 for these images.